from www.tmz.com – Newly minted porn star Farrah Abraham is so worried James Deen knocked her up while filming their infamous sex tape … she peed on a stick.

Sources close to Farrah tell TMZ … the former “Teen Mom” star hadn’t had sex in more than a year before James got her … and the duo didn’t wear condoms while filming … and Farrah wasn’t on birth control. Basically all the makings for an after school special.

We’re told Farrah recently missed her period and started freaking out, thinking she was growing a little porn spawn. So she went shopping for a pregnancy test at her local pharmacy.

We’re going to go to out on a limb that she’s NOT pregnant … for 2 reasons.